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Conophyton, or "cone stromatolites," from the Mesoproterozoic Lagamar Formation of the Vazante Group in south-central Brazil. This exposure was recently discussed in a paper by Geboy et al., 2013.
Sample provided by Dr. Jay Kaufman at University of Maryland, College Park.

Stromatolites viewed on the bedding plane. These fossil biofilms are Ediacaran in age, from the Witvlei Group of southern Namibia.
Sample loaned to M.A.G.I.C. by Dr. A. Jay Kaufman, of the University of Maryland, College Park.

Graptolites preserved as carbon films in the Edinburg Formation, exposed in Mint Spring, VA.
Callan Bentley, who collected this sample, wrote a blog post about the exposure, which you can read here: blogs.agu.org/mountainbeltway/2013/05/01/graptolites /
A geologic map of the site is available here:
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To celebrate the reopening of the Museum’s Prep Lab last year, we began work on an exciting new project: a sandstone block from Utah that was collected in the early 1900s at what is now Dinosaur National Monument. We knew that we had some type of dinosaur encased in the rock, but which one? September 23 marks the on...